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A146068 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. 0

%I #3 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,1,1,1,1,3,3,9,9,19,19,69,69,389,389,2287,2287,15081,

%T 15081,141721,141721,1694175,1694175,23795099,23795099

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.

%e Maximal 11 X 11 example

%e .0.0.1.0.0.0.0.0.1.0.0

%e .0.0.1.1.1.0.1.1.1.0.0

%e .1.1.0.0.1.0.1.0.0.1.1

%e .0.1.0.0.0.0.0.0.0.1.0

%e .0.1.1.0.0.0.0.0.1.1.0

%e .0.0.0.0.0.0.0.0.0.0.0

%e .0.1.1.0.0.0.0.0.1.1.0

%e .0.1.0.0.0.0.0.0.0.1.0

%e .1.1.0.0.1.0.1.0.0.1.1

%e .0.0.1.1.1.0.1.1.1.0.0

%e .0.0.1.0.0.0.0.0.1.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_, Oct 26 2008

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)